GitHub user sun-rui opened a pull request:
https://github.com/apache/spark/pull/7419
[SPARK-8844][SPARKR] head/collect is broken in SparkR.
This is a WIP patch for SPARK-8844 for collecting reviews.
This bug is about reading an empty DataFrame. in readCol(),
lapply(1:numRows, function(x) {
does not take into consideration the case where numRows = 0.
Will add unit test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sun-rui/spark SPARK-8844
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/7419.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #7419
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commit 965a2bd3bf18d585af53f3a3826b6b3ff7b0b5a5
Author: Sun Rui <[email protected]>
Date: 2015-07-15T14:04:05Z
[SPARK-8844][SPARKR] head/collect is broken in SparkR.
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